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/*
* Copyright (C) 2009, Nokia
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
public class Tracker.SparqlBuilder : Object {
enum State {
UPDATE,
INSERT,
DELETE,
SUBJECT,
PREDICATE,
OBJECT,
BLANK
}
public string result {
get { return str.str; }
}
public int length { get; private set; }
State state {
get { return states[states.length - 1]; }
}
State[] states;
StringBuilder str = new StringBuilder ();
public SparqlBuilder.update () {
states += State.UPDATE;
}
public void drop_graph (string iri)
requires (state == State.UPDATE)
{
str.append ("DROP GRAPH <%s>\n".printf (iri));
}
public void insert_open ()
requires (state == State.UPDATE)
{
states += State.INSERT;
str.append ("INSERT {\n");
}
public void insert_close ()
requires (state == State.INSERT || state == State.OBJECT)
{
if (state == State.OBJECT) {
str.append (" .\n");
states.length -= 3;
}
states.length--;
str.append ("}\n");
}
public void subject_iri (string iri) {
subject ("<%s>".printf (iri));
}
public void subject (string s)
requires (state == State.INSERT || state == State.OBJECT)
{
if (state == State.OBJECT) {
str.append (" .\n");
states.length -= 3;
}
str.append (s);
states += State.SUBJECT;
}
public void predicate_iri (string iri) {
predicate ("<%s>".printf (iri));
}
public void predicate (string s)
requires (state == State.SUBJECT || state == State.OBJECT || state == State.BLANK)
{
if (state == State.OBJECT) {
str.append (" ;\n\t");
states.length -= 2;
}
str.append (" ");
str.append (s);
states += State.PREDICATE;
}
public void object_iri (string iri) {
object ("<%s>".printf (iri));
}
public void object (string s)
requires (state == State.PREDICATE || state == State.OBJECT)
{
if (state == State.OBJECT) {
str.append (" ,");
states.length--;
}
str.append (" ");
str.append (s);
states += State.OBJECT;
length++;
}
public void object_string (string literal)
requires (state == State.PREDICATE || state == State.OBJECT)
{
if (state == State.OBJECT) {
str.append (" ,");
states.length--;
}
str.append (" \"");
char* p = literal;
while (*p != '\0') {
size_t len = Posix.strcspn ((string) p, "\t\n\r\"\\");
str.append_len ((string) p, (long) len);
p += len;
switch (*p) {
case '\t':
str.append ("\\t");
break;
case '\n':
str.append ("\\n");
break;
case '\r':
str.append ("\\r");
break;
case '"':
str.append ("\\\"");
break;
case '\\':
str.append ("\\\\");
break;
default:
continue;
}
p++;
}
str.append ("\"");
states += State.OBJECT;
length++;
}
public void object_boolean (bool literal) {
object (literal ? "true" : "false");
}
public void object_int64 (int64 literal) {
object (literal.to_string ());
}
public void object_date (ref time_t literal) {
var tm = Time.gm (literal);
object_string ("%04d-%02d-%02dT%02d:%02d:%02d".printf (tm.year + 1900, tm.month + 1, tm.day, tm.hour, tm.minute, tm.second));
}
public void object_blank_open ()
requires (state == State.PREDICATE || state == State.OBJECT)
{
if (state == State.OBJECT) {
str.append (" ,");
states.length--;
}
str.append (" [");
states += State.BLANK;
}
public void object_blank_close ()
requires (state == State.OBJECT && states[states.length - 3] == state.BLANK)
{
str.append ("]");
states.length -= 3;
states += State.OBJECT;
length++;
}
public void append (string raw)
requires (states.length == 1)
{
str.append (raw);
}
}
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